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SU Dashpot Oil Options
https://ausmini.com/forums/viewtopic.php?f=2&t=92965		 Page 1 of 3
Author:  Morbo28 [ Fri Jun 24, 2016 9:32 pm ]
Post subject:  SU Dashpot Oil Options
I was searching for what oil should be used in an SU and there were a few answers that popped up. One site however said ignore any other advice, you should run only SAE20W oil in SUs. Is tat what people here are using?

Penrite make some SU-specific oil I see (strangely enough they have both an "SU Damper Oil and an "SU Dashpot Oil") and I guess I could order that.

I popped into Supercheap to see if they had anything but they don't. I have 20W motorcycle fork oil in my shed already, could I use that?
Author:  gtogreen1969 [ Fri Jun 24, 2016 9:42 pm ]
Post subject:  Re: SU Dashpot Oil Options
Fork oil is fine.
I use ATF just because it is in the cupboard.
Author:  Morbo28 [ Fri Jun 24, 2016 9:46 pm ]
Post subject:  Re: SU Dashpot Oil Options
gtogreen1969 wrote:
Fork oil is fine.
I use ATF just because it is in the cupboard.
Sweet cheers :)

Btw here is the difference re the two SU oils Penrite sells

Penrite website wrote:
SU DASHPOT is suitable for use in pre 1940 SU carburettors, which do not incorporate a damper in the
dashpot assembly. Removing the dashpot cap can readily identify this type of carburettor, as there is no
damper rod on the underside.

SU DAMPER is suitable for post 1940 vehicles using SU and Stromberg carburettors incorporating a damper
in the dashpot assembly. The damper assembly is attached to the cap and can be seen when the cap is
removed.
Author:  Minicooper4me [ Fri Jun 24, 2016 9:56 pm ]
Post subject:  Re: SU Dashpot Oil Options
Go for the forking oil.
Author:  timmy201 [ Fri Jun 24, 2016 9:59 pm ]
Post subject:  Re: SU Dashpot Oil Options
My local shop ordered in the Penrite stuff for me. Probably a bit expensive for how small the bottle is, but you don't use very much at all...
Author:  Morbo28 [ Fri Jun 24, 2016 10:19 pm ]
Post subject:  Re: SU Dashpot Oil Options
Found it online here - http://www.thefarmstore.com.au/su-dampe ... an-classic
About $6 but the shipping makes it about $17.

(Note they have the ISO listed incorrectly on this website though)

Will find that fork oil tomorrow and if I can't find it I'll order this stuff online or through local parts shop.

Cheers for your input folks :)
Author:  minimanic [ Fri Jun 24, 2016 10:42 pm ]
Post subject:  Re: SU Dashpot Oil Options
Both Penrite Dashpot and Damper oil are available on the shelf in store at Minis Plus.
I'll try to gety them up on the online store in the next few days, in the meanwhile if any one wants it shipped just give us a call.
(03) 9729 1323.
Ben.
Author:  1071 S [ Fri Jun 24, 2016 11:43 pm ]
Post subject:  Re: SU Dashpot Oil Options
SU oil is just straight SAE 30.

I find ordinary engine oil (20W50) or some such will work fine.

Cheers Ian
Author:  Morbo28 [ Sat Jun 25, 2016 8:58 am ]
Post subject:  Re: SU Dashpot Oil Options
1071 S wrote:
SU oil is just straight SAE 30.

I find ordinary engine oil (20W50) or some such will work fine.

Cheers Ian


Hi Ian, Penrite list the Dashpot oil as ISO 15 and the Damper oil as ISO 68

Image

And using the conversion chart

Image

That puts the Dashpot oil at 5 W (or lighter) and the Damper oil at 20 W. The Damper oil is the right one for us.
I think the 20W50 would work well too then as you say, by the look of it.

minimanic wrote:
Both Penrite Dashpot and Damper oil are available on the shelf in store at Minis Plus.
I'll try to gety them up on the online store in the next few days, in the meanwhile if any one wants it shipped just give us a call.
(03) 9729 1323.
Ben.

If I can't find the 20W fork oil or motor oil in my shed, I'll definitely give you a call!
Author:  BBY755 [ Sat Jun 25, 2016 9:23 am ]
Post subject:  Re: SU Dashpot Oil Options
20W50 solved my stumbling on acceleration troubles.....was using lighter oils previously.....
Author:  Morbo28 [ Sat Jun 25, 2016 9:33 am ]
Post subject:  Re: SU Dashpot Oil Options
Hmmm interestingly this site http://britishclassicmotors.com/3301.html

Outlines that 20W50 is too heavy...
Image
Author:  drmini in aust [ Sat Jun 25, 2016 9:56 am ]
Post subject:  Re: SU Dashpot Oil Options
I had twin HS4s on Barney's 1293 and it was stumbling on initial acceleration, this was in summer. Needles were #6.
The A/F meter showed it going too rich there, not lean. Graham Russell suggested take the dampers OUT. I did, and it fixed it.
From then on, I ran ATF in winter and nil in summer. YMMV... :)
Author:  Goldbrocade_62 [ Sat Jun 25, 2016 9:58 am ]
Post subject:  Re: SU Dashpot Oil Options
The su damper oil 68 some hydraulic oils are 68 eg hyd 68 maybe the same stuff
Author:  Morbo28 [ Sat Jun 25, 2016 10:38 am ]
Post subject:  Re: SU Dashpot Oil Options
Makes sense about the 20w50 really as it will be 50 weight when it is cool and it won't heat up nearly as much as if in the engine.

Sent from my Nexus 6P using Tapatalk
Author:  winabbey [ Sat Jun 25, 2016 1:43 pm ]
Post subject:  Re: SU Dashpot Oil Options
This is what SU sell:

http://www.sumidel.com/shop/item/damper-oil-sae-20

http://sucarb.co.uk/dampers-caps-oil/damper-oil.html
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